|38,000yen(around the 1978 time)
It is the stereo power amplifier which inherited the technology of M-A01.
Circuit composition has adopted two steps of
differential amplification, the current mirrored live, and a whole page direct
connection pure complimentary OCL circuit. Moreover, the NPN/PNP silicon
transistor with high reliability to which the pair characteristic is good and it
was equal is used for a final stage.
Furthermore, the twin transistor which
was excellent in the pair characteristic was used for first rank differential, and a pre-driver stage is having differential amplification composition which
carried out the assembly of the current mirror circuit, and has realized
improvement in the direct-current stability of a circuit, and high gain.
The peak level indicator by five LED per channel is carried.
indicator circuit carries out logarithm compression of the input signal, and
also the about 0.1 second peak hold of detection and the detection signal is
carried out. And level detection is carried out by a comparator and LED lights
up corresponding to each level.
Moreover, the range change-over switch of
x0.01 is prepared, and a level exact also at the time of small volume can be
The protection circuit which combined electronic and a relay is
If the direct-current electric potential more than a fixed level
arises in a power amplifier output terminal, this protection circuit will
operate. Thereby, the output and speaker of amplifier are separated and a
speaker is protected from breakage.
Moreover, it is designed operate also as a muting circuit which prevents
the unpleasant clicking noise generated at the time of power-source ON-OFF.
||Stereo power amplifier
||50W+50W (8 ohms, 20Hz - 20kHz, THD0.05%)
||0.006% (8 ohms, 1W output, 20Hz - 20kHz)
|Cross modulation distortion
|0.01% (8 ohms, Output power)
ohms, 1W output)
||15Hz - 100kHz (THD 0.1%)
||10Hz-100kHz+0 -1 dB
|Phono Output voltage
||Width 270x height 140x depth of 243mm